Improved method of protecting the heated pasts of furnaces



E. SCOVIL.

Patentd (M422, 1867.

GREOLW m Protecting Furnaces. o. 70,031.

IIII\ I NJEFERS PHOTO LITHD AFN ASH N UN. D C

sm gma germ: gum.

EDWARD GEORGE 'SQOVIL, ST. JOHN, NElV BRUNSWICK. Letters Patent No.70,031, dated OctoberZQ, 1867.

flit: firtstnle infant trim ilgttt Esters that m mating part at thesame.

TO ALL WHOM IT MAY CONCERN:

Bej i tiknown that I, EDWARD GEORGE SCOYIL, of St. John, New Brunswick,have invented a new and improved 'Method of Protecting Heated Surfaces;and I do hereby declare that the following is a full, clear, and exactdescription thereof, which will enable others skilled in the art tomalre and use the same, reference being had to the accompanying drawing,forming part of this specification.

Myimprovement relates to that class of inventions which appliestofurnaces for the manufacture of iron, and for other purposes whereintense heat is necessary, my object being to protect and secure thoseparts of the furnace which are most exposed to the heat from'destructionor damage. The drawing represents a side elevatioh of apuddling-furnace, showing the water-reservoir and pipes which I use incarrying out my invention. A is the furnace=door, B is the door frame,CC are the boshcs, and D is the water-reservoir.

It is well known that there are portions of puddling and other furnaceswhich are very much exposed to heat, and in consequence, of which theyare frequently destroyed, or, if not destroyed, damaged so as toseriously interfere with the working of the furnace, and various deviceshave been resorted to by those engaged in the manufacture of ironfor'the protection of those eirposed parts. It is not uncommon forcurrents of air to be forced through the boshes and in contact with theheated plates, for the purpose of cooling the heated surfaces, while theair thus heated has been used for the blast. Again the boshes and otherexposed parts have been cast hollow, and water has been either forced orsufi'ered to run through the cavities thus formed for the purpose ofcooling the heated surfaces and carrying of a portion of the heat. Airhas been found insuificient for the purpose, in consequence of theintensity of the heat, while the supply of water by the old method wasliable to be interrupted from various causes, and generally at a timewhen an intermission of even one minute would cause very serious damage.After a good dealof experience in iron manufacture, and after manyexperiments, with the design of overcoming the difiiculty, I have atlength discovered amethod which has proved to be an eflicientprotection, and the thing so much needed.

In'constructing my furnace the exposed portions are made hollow andwater-tight, similar to those heretofore used for water. The door, thedoor-frame, the exposed castings, and the boshes are .thus formed. Abovethe furnace, sufliciently high to insurea head of water, I place areservoir, 1), andconnect it by water pipes to the exposed portions ofthe furnace in such a manner that while there is water in thereservoirthereis a cen-' stalit circulation of water through the hollow exposedportions of the furnace. E is the supply pipe, which keeps the reservoirconstantly supplied with water. The pipes a and (1 connect the reservoirwith one of the boshes C, one pipe at each end of the bosh. The pipe asconnects with the bottom of the reservoir, while the pipe a connectswith the top or near the top. The effect of this arrangement is that thewater will run down the pipe at, from the bottom of the reservoir, wherethe water is comparatively cold, into and throughthe bosh, becomingthereby greatly heated. Being thus charged with heat, and expanded, itrises through the pipe d and is discharged back intothe reservoir, andin this way a constant current is maintained through the bosh, carryingoii'a portion of the neat, and preventing the bosh from being damaged.This system depends upon the heating and expansion of the water, bywhich a constant circulation is kept up through the pipes. The door anddoor-frame and other exposed plates and castings are connected with thereservoir in the same way, and the same circulation of water isconstantly going on'through them. The pipes b b which connect the door Awith the reservoir, are partly formed of elastic hose pipe to allow thedoor to be raised and lowered; d d are pipes which connect thefurnace-door frame and castings with the reservoir, andff connect theother bosh G in the same 'way. L is a waste or overflow pipe, whichconveys the overflowing water to a. tank where it is used forcooling thetools. By this arrangement no damage would be caused by the stoppage ofwater through the supply pipe E for a considerable length of time, asthere would be no overflow, and the water in the reservoir would beretained, and the circulation would be maintained. G is a standard,which supports the fulcrum of the lever H by which the furnace-door israised. J is a chain, connecting the end of the lever with the door. Itis a. chain to operate the lever. 1

I do not confine myself to the use of my arrangement forpuddling-furnaces only, nor to furnaces of any or all kinds. It maybeapplied to furnace-doors or door-frames of any kind, to tuyere irons,water-hacks," or exposed metallic plates or surfaces of any kind, toprotect them from too intense heat.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-- Protecting metallic and other surfacesfrom the effects of heat by the circulatiorrof water, when thecirculation is caused by the heat, and in the manner as substantiallyherein shown and described.

EDWD. .GEO. SGOVIL.

Witnesses:

JAMES DounvrLL's, JAMss Scovrn.

